A few more straws to grab at
Some Ads, sounds like grounding.
To increase the TBo Hours on some engines says something about replacing the stator etc >> ie known problems
Civil Aviation Safety Authority - Piston engines
otax Piston Engines
AD/ROTAX/2 Ignition Electronic Module 3/95 TX
Applicability: All 912 A series engines with serial numbers 4,076.062 to 4,076.220 inclusive.
Requirement: Inspect, and if necessary, repair the grounding cable assembly on electronics module
Part Number 965 356, in accordance with Bombardier Rotax Mandatory Technical
Bulletin 912-06 dated 21 November 1994.
Note: Austro Control (Austria) AD 80 dated 28 November 1994 refers.
Compliance: 1. Prior to further flight after 12 January 1995, but no later than 31 January 1995.
2. Prior to installation of an electronic module on an engine.
Background: Bombardier Rotax have reported that production machinery problems have resulted in
the electronics module grounding cable lug being incorrectly fitted, this could result
in engine misfiring or stoppage. This Directive requires the cable lug to be inspected
for correct installation.